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Mikubot-2/otouto/bindings.lua

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--[[
bindings.lua (rev. 2016/08/20)
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otouto's bindings for the Telegram bot API.
https://core.telegram.org/bots/api
See the "Bindings" section of README.md for usage information.
Copyright 2016 topkecleon <drew@otou.to>
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License version 3 as
published by the Free Software Foundation.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
for more details.
You should have received a copy of the GNU Affero General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
]]--
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local bindings = {}
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local https = require('ssl.https')
local json = require('dkjson')
local ltn12 = require('ltn12')
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local mp_encode = require('multipart-post').encode
function bindings.init(token)
bindings.BASE_URL = 'https://api.telegram.org/bot' .. token .. '/'
return bindings
end
-- Build and send a request to the API.
-- Expecting self, method, and parameters, where method is a string indicating
-- the API method and parameters is a key/value table of parameters with their
-- values.
-- Returns the table response with success. Returns false and the table
-- response with failure. Returns false and false with a connection error.
-- To mimic old/normal behavior, it errs if used with an invalid method.
function bindings.request(method, parameters, file)
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parameters = parameters or {}
for k,v in pairs(parameters) do
parameters[k] = tostring(v)
end
if file and next(file) ~= nil then
local file_type, file_name = next(file)
local file_file = io.open(file_name, 'r')
local file_data = {
filename = file_name,
data = file_file:read('*a')
}
file_file:close()
parameters[file_type] = file_data
end
if next(parameters) == nil then
parameters = {''}
end
local response = {}
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local body, boundary = mp_encode(parameters)
local success, code = https.request{
url = bindings.BASE_URL .. method,
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method = 'POST',
headers = {
["Content-Type"] = "multipart/form-data; boundary=" .. boundary,
["Content-Length"] = #body,
},
source = ltn12.source.string(body),
sink = ltn12.sink.table(response)
}
local data = table.concat(response)
if not success then
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print(method .. ': Connection error. [' .. code .. ']')
return false, false
else
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local result = json.decode(data)
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if not result then
return false, false
elseif result.ok then
return result
else
assert(result.description ~= 'Method not found', method .. ': Method not found.')
return false, result
end
end
end
function bindings.gen(_, key)
return function(params, file)
return bindings.request(key, params, file)
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end
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end
setmetatable(bindings, { __index = bindings.gen })
return bindings